Illuminating apparatus for photographic use



Jan. 27, 1931. 1.. G. SIMJIAN ILLUMINATING APPARATUS FOR PHOTOGRAPHICUSE FiledMarch 24, 1928 20 "strained expressions.

Patented Jan. 27, 1931 Q intr rnnn e. sin IA n, ionnnw rnvmeommm minnunilnnrlnnrrannrusFoRrHoT'oGnArHIc sn portrait photography,ingparticula-r, the nature of the light employed to jillumi na'te thesiibjectis ofthe' utmost importance,

' pifoximatedaylightin its diffusion and, theres foregminimizethediscomfortofcthefsuhject and his'tendency to assume unnatural Sand W'ththis object in View, my invention consists in' an illuminating apparatusfor photogralphic use "comprising. a source of f artificial light, ashield for preventing the' rays ll of'light emanatinglfromthe saidsource from beating unmodified upon I the -sub3ect, .a? re fleetingmedium positioned to reflect; upon the lilbject theli'glit eman atingfrom the said source, and 'a light-difiusing medium pos tioned soas toheinterposed between the'said light source and the reflecting: mediumi'and also between the latter th'csubject; e} by Ii ght rays emanating 1from the sai d' 'light Selim a d us d rsjibe ns ef t by the saidreflecting medium'and again diffused being reflected thereby toward thesub je t r r Inlthe accompanying drawings; p Fig. 1 is a View inelevation of an: illii ni' v nating apparatusfor. photographic use con}.structed in accordance :withimy invention; :Figz-Z isjj-a-verticalsectional'view thereof,

i taken on the line 2+2 of liigll; I

as Fig 3 is a b en. de ail s s al i lusrests'upon abase'12 ahdhaswithinitslower Application filed March 24,f19:28. Seria1 No." 264,4Q 4.

trating another form of combined reflector and difiusing medium; and iFig. 1 is a View correspondingto Fig. 2 but showing anotherforin whichan illuminating apparatus constructed in accordancewith myinvention mayassume} "In carrying out lny invention, as herein sh.own, I 'en1ploy an'incandescent bulb 10 mounted within 'a lainp-housing 11 which end areflector 13 *directgyi beneath the bulb 10.: Resting upon the openupper end ofthe lamp housingllll is' a;water=compart1nent 14 having itsupper and lower walls lfiand :16

composed of transparent glass-or other suitable material,..the spacefloetw'een which is filled with a body of water, as indicatedin Fig. 2"Light directedupward from the bulb "10 and reflector 13 is-compelledtopass through the water in the water compartment, sothat, to a largeextent, theihea-trrays' are checkedfl- The said housing 11 serves as ashield to prevent the lOUlb'lO from shining directlyu-pon the subject Inthe structure shown, the shield is opaque, but if desired it maybemadesemi-transparent Immediately to the rear of thelampi-hous ing 11 Iposition a vertical reflecting-anddilfusi'ng panel 17 which, as shown,com-. prisesairont layer 18 of ground glass or other'suitableqdiifusingmedium and a'la'yer V, 19 of transparent glass, the bac'klof which isprovided with coating 20 ofsilver' or the like to reflect'thejlightemanating from the bulb 10 forward toward the subjectl Arran ged abovethe. reflecting-and-diiiusl ingpanel 171 positionin series two additional inclined diliusingand-refiecting panels 21jand 22, the formerbeing but slightly inclined with respect to the panel li and the latterbeing, 'insturn, slightly inclined with, respect 'tojthefpanel. 21. 1The" panels 21 and.

22 just-mentioned correspond-to the'panel 17, and he'ar' correspond ngreference nue a' s to; d s g a e thei ev ralip' ts- Forward of thelamp-housing 11' and up standing from the base 12, I position a shield23 upon theupper endof which is mounted an inclined mirror 24 whichserves to reflect stray rays back against the panels 17 21 and 22,. Thesaid shield 23 serves to conceal the lamp-housing 11 and wiring from theview of the subject.

' In the operation of my improved illuminating apparatus, as shown inFigs. land 2,

I the light rays projected upward from the bulb 10 are cooled by theirpassage through the water in the compartment 14 and pass through theground-glass diffusing medium.

18 of the respective panels 17, 21 and 22, by

which they are broken up and diffused, and

impinge upon the reflecting coatings 20, by which they are reflectedoutward toward the subject and caused to repass through the diffusingmediums 18 of the various panels and further diffused and broken upbefore they reach the subject who, by this double diffusion, is sparedthe discomfort ,ofany appreciable glare.

In Fig. 3 of the drawings I have illustrated a section of a panel whichconsists of asingle thickness 25 of glass or other suitable materialwhich is provided upon its rear face with a coating 26 of silver orother reflecting material, and on its opposite face with a-co ating 27of a so-called ground-glass compound. The panel just describeddischarges all the functions of the type shown in Fig. 2 and may bereadily substituted therefor if de-.v

sired. a.

In Fig. 4 of the drawings I have illustrated another arrangement ofparts to secure sub.-

stantially the same result obtained by the structure of Figs. 1 and 2.In this figure I employ a vertical mirror panel .28 and two inclinedmirror panels 29 and 30 arranged in the manner of the'panels 17, 21and22respectively shown in Fig. 3. Directly above the water-compartmentlet I mount a sheet 310i ground glass or other suitable diffusing mediumthrough which the rays of light .must pass beforeimpinging upon thepanels 28,- 29 or 30, by which latter they are reflect- U ed outwardtoward. the subject and are caused to pass through a seconddiffusing-Plate 32 spaced in front of the said panels 28, 29 and 30. It will benoted that the light thrown upon the subject by the apparatusillustrated in Fig. 4 is diflused, reflected and again diffused withsubstantially the same effect as that produced by the apparatusillustrated in Figs. land 2. I

I wish to have it understood that I do not limit myself toreflectors'and diffusing elements'of any particular character, since itis obvious that a wide range of material may, be employed for thepurpose, it being essen- I tial only" that the respective elements ofwhatever composed be capable of discharging their respective functions.

I claim:

1. An illuminating apparatus for photographic use comprising a source ofartificial light; a shield for preventing the rays of lightemanatingfrom the said source from beating unmodified upon the subject; reflectin-means positioned to reflect light upon the su ject; semi-transparentlight-diffusing means interposed between the said lightsource and thereflectingsmeans and also between the latter and the subject .andhavinga forward 7 light-receiving mat-surface; whereby light rays emanatingfrom the said light-source and impinging upon the said vreflecting-meansare diffused before being reflected by the said reflecting-means andagain diffused after being reflected thereby toward the subject, andwhereby undilfused light-source and impinging upon the saidreflecting-meansare diffused before being reflected by the saidreflecting-means and again diffused after being-reflected thereby towardthe subject, and whereby undiflused reflected rays are prevented fromreaching the subject.

3. An illuminating apparatus for photographic use comprising a source ofartificial light; a shield for preventing the rays of light emanatingfrom the said source from f beating unmodified upon "the subject;reflecting-means positioned to reflect light upon the subject;semi-transparent light-diffusing means arranged parallel with i thelight? source and the reflecting-means and also .be-

tween the latter and the subject and having a forward light-receivingmat-surface;

whereby light rays emanating from the-said light-source and impingingupon the" said reflecting-means 'arediffus'ed before being reflected'bythe said reflecting-means and again diffused after being reflectedthereby towardthe subject, and whereby undiffused reflected rays areprevented from reaching the subject. V

. 4. An illuminatingapparatus for photographic use comprising a sourceof artificial light; a shield for, preventing the rays 1 of lightemanating from the said sourcefrom beating unmodified upon the subject;reflecting-means positioned to reflect light upon the subject; a singlesemi-transparent lightdiffusing plate arranged parallel with thelight-source and the reflecting-means and also between the latter andthesubject and having a forward light-receiving mat-surface; wherebylight rays emanating from the said light-source and impinging upon thesaid reflecting-means are diffused before being reflected by the saidreflecting-means and again diflused after being reflected thereby towardthe subject, and whereby undifiused reflected rays are prevented fromreaching the subject. .r

- In testimony whereof, I- have signed this specification.

LUTHER SIMJIAN.

